As for New York men, Stanger said they’re lucky the local male-female ratio is heavily in the guys’ favor. But she said men are often too critical of their date’s background and social status.

“Like where did you go to school? Who’s your family? Do you go to the Hamptons?” Stanger said. “They’re very snobby and elitist I would say.”

Stanger advised single men not to make their mind up about a person in the first six seconds of checking them out. "I don’t think in this time and age, other than wanting to have sex with you, could they know that that’s a good wife, a good girlfriend,” she said.

Pro Athletes' Wives & Girlfriends

Stanger said women often sleep with guys too soon.

“And we TMI, we tell them too much information about us thinking they’re our best friend,” she told NBCUDirect. “They’re not our friend, they’re our mate.”